MathDB

Let

S = \{1,2,\dots,2014\}

. For each non-empty subset

T \subseteq S

, one of its members is chosen as its representative. Find the number of ways to assign representatives to all non-empty subsets of

S

so that if a subset

D \subseteq S

is a disjoint union of non-empty subsets

A, B, C \subseteq S

, then the representative of

D

is also the representative of one of

A

B

C

.
Warut Suksompong, Thailand

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